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Claudia Wang, Ph.D., is a professor at the School of Physical Education, at Pingdingshan University; John Preisser, Ph.D., is a professor at the Department of Biostatistics, at the University of North Carolina at Chapel Hill; Yunro Chung, Ph.D., is a postdoc fellow at the Fred Hutchinson Cancer Research in Seattle, Kaigang Li, PhD, is an Assistant Professor at the Department of Health & Exercise Science at Colorado State University.

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Because this study was a secondary data analysis of publicly available datasets with no personally identifiable information, the study protocol was exempted from the Institutional Review Board approval.

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Not applicable.

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The authors declare that they have no competing interests.

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